ESTIMACIÓN DE MASA CORPORAL DE PROTEROTÉRIDOS DEL CUATERNARIO (MAMMALIA, LITOPTERNA) Y DESCRIPCIÓN DE UN NUEVO EJEMPLAR DE Neolicaphrium recens Frenguelli, 1921
2020
Body mass estimation of Quaternary proterotheriids (Mammalia, Litopterna) and description of a new specimen of Neolicaphrium recens Frenguelli, 1921. A body mass estimation for Quaternary specimens of the family Proterotheriidae was performed using predictive regression equations for extant ungulates. A body mass of 20 –40 kg for Neolicaphrium recens and of <70 kg for Uruguayodon alius are determined based on the analysis of dental, mandibular, and postcranial dimensions including lengths, areas, and volumes. This study incorporates estimates obtained through measurements of elements of the appendicular skeleton, humerus, tibia and astragalus. Limb bones are directly related to body support and locomotion, and therefore their measurements are better estimators of body mass than craniodental dimensions. Additionally, is described and studied a new material of N. recens exhumed from Pleistocene deposits of Colonia Department, southwestern Uruguay.
Keywords: body mass, Litopterna, Neolicaphrium recens, Proterotheriidae, Uruguayodon alius.
Uma estimativa de massa corporal e feita para especimes quaternarios da familia Proterotheriidae por meio de equacoes de regressao preditiva para ungulados atuais. Com base na analise de dimensoes dentaria, mandibular e pos-craniana, que inclui comprimentos, areas e volumes, foram determinadas massas corporais de 20 a 40 kg para Neolicaphrium recens e <70 kg para Uruguayodon alius. Este estudo incorpora estimativas obtidas atraves de medidas de elementos do esqueleto apendicular, umero, tibia e astragalo. Os ossos dos membros estao diretamente relacionados ao suporte e a locomocao do corpo e, portanto, suas medidas sao melhores estimadores de massa corporal do que as dimensoes crânio-dentarias. Alem disso, um novo material de N. recens proveniente de sedimentos pleistocenicos do Departamento de Colonia, sudoeste do Uruguai, e descrito e estudado.
Palavras-chave: Litopterna, masa corporal, Neolicaphrium recens, Proterotheriidae, Uruguayodon alius.
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